Answer:
Osteons are cylindrical in structure. It is the unit of bones and major component of it is collagen fibres.
Explanation:
Osteons are the units of bone. These are cylindrical structures present in the spongy bone. Osteons are the cylindrical structures having different layers known as lamellae. These lamellae have some small cells called osteocytes. The osteocytes have central lacunae. It secretes the matrix of the bone cell. In short, the osteone produces matrixes of the bone. The lamellae are the extracellular matrix formed of collagen. There is a central canal present in the osteone known as the Haversian canal. Inside the Haversian canal lymph vessels, arteries, nerves are present. There are a number of ostea present in a bone.
